Computer Code: |
PAH |
Preferred Map Code: |
PHM |
Status Code: |
Full |
Age range: |
Comley Series (EC)
— Comley Series (EC) |
Lithological Description: |
Grey medium-grained sandstone with thin breccia layers in basal 17m: main part in beds 0.2-0.8m thick showing herringbone cross-bedding. Very rare mudstone beds or drapes. |
Definition of Lower Boundary: |
At base of first bed to show cross bedding and an undulatory top surface. Lower sandstones are massive, with planar or only gently undulatory tops. |
Definition of Upper Boundary: |
Bedding plane beneath first significant development of mudstone with thin, sharp-based sandstone beds. Mudstone drapes ubiquitous in beds above this. |
Thickness: |
30 - 56m. 35m in type section (min), 34m in reference section (min). |
Geographical Limits: |
From Nuneaton town centre, extending northwest for 3.5km to just east of Cherry Tree Farm (SP 3548 9220-3262 9521) |
Parent Unit: |
Hartshill Sandstone Formation (CQ)
|
Previous Name(s): |
Park Hill Quartzite [Obsolete Name and Code: Use PAH]
(-3602)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Northeast face of Hartshill Quarry, 700m west-north-west of Hill Farm (SP 3425 9360) |
Partial Type Section |
Upper northwest face of Boons Quarry, 150m west-north-west of Grange Farm. |
Reference(s): |
Brasier, M D, Hewitt, R A and Brasier, C J, 1978. On the late Precambrian - Early Cambrian Hartshill Formation of Warwickshire. Geological Magazine, Vol.115/1, p.21-36. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E169
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